Abstract

Bio-oils obtained by pyrolysis of lignocellulosic biomass are a complementary alternative to fossil fuels in the manufacturing process of fuels and other chemicals. A comparison was made between the bio-oils obtained in fixed bed (FB) and bubbling fluidized bed (BFB) reactors, using sawdust of Eucalyptus sp. (hardwood) and Picea abies (softwood), waste produced on a large scale in different countries. It was observed a higher yield of liquid product in BFB reactor (~ 70%) than in the FB reactor ...

Bio-oils obtained by pyrolysis of lignocellulosic biomass are a complementary alternative to fossil fuels in the manufacturing process of fuels and other chemicals. A comparison was made between the bio-oils obtained in fixed bed (FB) and bubbling fluidized bed (BFB) reactors, using sawdust of Eucalyptus sp. (hardwood) and Picea abies (softwood), waste produced on a large scale in different countries. It was observed a higher yield of liquid product in BFB reactor (~ 70%) than in the FB reactor (~ 50%). The ketones and phenols were the major compounds obtained in these bio-oils, respectively. The prevalence of these chemical compounds suggests that these bio-oils have potential for the polymer industry, food and others. The analysis by GC×GC/TOFMS was important for the study of the three bio-oils obtained from BFB, as inaccuracies in the 1D-GCqMS analysis were verified due to co-elutions. The use of zeolite ZSM-5 as a catalyst on the BFB reactor increased the percentage of aromatic hydrocarbons in the bio-oil, showing the potential of this type of process and residue for fuel production and the presence of polyaromatic hydrocarbons brought an alert to the proper management of pyrolysis in order to avoid the production of toxic compounds. ...